From: Oliver Hartkopp socketcan@hartkopp.net
[ Upstream commit 30ffd5332e06316bd69a654c06aa033872979b7c ]
When reading from an unbound can-isotp socket the syscall blocked indefinitely. As unbound sockets (without given CAN address information) do not make sense anyway we directly return -EADDRNOTAVAIL on read() analogue to the known behavior from sendmsg().
Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol") Link: https://github.com/linux-can/can-utils/issues/349 Link: https://lore.kernel.org/all/20220316164258.54155-2-socketcan@hartkopp.net Suggested-by: Derek Will derekrobertwill@gmail.com Signed-off-by: Oliver Hartkopp socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- net/can/isotp.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/net/can/isotp.c b/net/can/isotp.c index d0581dc6a65f..cb5546c186bc 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -1003,12 +1003,16 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, { struct sock *sk = sock->sk; struct sk_buff *skb; + struct isotp_sock *so = isotp_sk(sk); int err = 0; int noblock;
noblock = flags & MSG_DONTWAIT; flags &= ~MSG_DONTWAIT;
+ if (!so->bound) + return -EADDRNOTAVAIL; + skb = skb_recv_datagram(sk, flags, noblock, &err); if (!skb) return err;